This is a mount for bicycle saddle rails to a go pro or any other compatible items.
The main difference with all other commercial mounts is that this one is designed to mount on the end-area of the rails (the area that is usually angled around 45 degrees), which I needed because I didn't had enough saddle setback to mount it on the horizontal part of the rails as every other mount.
You will need 3 M5 Screws
and 3 M5 Lock Nuts
which you can get from home depot, or online easily.
I have mine tightened at aroun 2nm. if you don't have a torque tool, just hand tighten, use your wrist instead of your arm as leverage. In my case this has been tight enough that the mount doesn't move even with large bumps, I have only used it on a road bike, so not sure how would it hold if you use it on a mountain bike for downhill/jumping, if you are planning on that I would go with the multijet infusion plastic instead which is more resistant, albeit more expensive..